package xscscscc;

public class E9 {
    public static final int TIMES = 100000;
    public static void main(String[] args){
        E9.testString();
        E9.testStringBuffer();
        E9.testStringBuilder();
    }
    public static void testString(){
        long startTime = System.currentTimeMillis();
        String str = "";
        for (int i = 0; i < TIMES; i++){
            str +="test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime:"+(endTime - startTime));
    }
    public static void testStringBuffer(){
        long startTime = System.currentTimeMillis();
        StringBuffer str = new StringBuffer();
        for (int i = 0; i < TIMES; i++){
            str.append ("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime:"+(endTime - startTime));
    }
    public static void testStringBuilder(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < TIMES; i++){
            str.append ("test");

        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuilder test usedtime:"+(endTime - startTime));


    }

}
